Golf club head with improved inertia performance

Abstract

A golf club head that is capable improving on the inertia properties of a golf club head all while also improving the Center of Gravity (CG) location is disclosed herein. More specifically, the golf club head in accordance with the present invention achieves a relative low Moment of Inertia (MOI) about the Z-axis (MOI-Z) as well as a relatively low MOI about the Shaft-axis (MOI-SA), all combined with a high MOI about the X and Y-axis (MOI-X and MOI-Y) and maintaining a consistently and relatively low CG location measured along a direction tangent to the hosel axis along the X-Y plane (CG-B).

What is claimed is: 
     
         1 . A golf club head comprising:
 a frontal portion further comprising a striking face that helps define a face center, located at a forward portion of said golf club head;   a rear portion, located aft of said striking face, and coupled to said frontal portion to define a club head volume of between about 250 cc and about 400 cc; and   at least one first weighting member located near a central portion of said golf club head in a heel to toe orientation, substantially in line with and behind said face center;   wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said striking face with a positive direction towards a heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive direction towards a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards said frontal portion of said golf club head, and   wherein said golf club head has a moment of inertia about said x-axis (MOI-X), a moment of inertia about said y-axis (MOI-Y), and a moment of inertia about said z-axis (MOI-Z), and   wherein said golf club head has a MOI-X to MOI-Y ratio of greater than about 0.65.   
     
     
         2 . The golf club head of  claim 1 , wherein said golf club head has a MOI-Y to MOI-Z ratio of greater than about 1.5. 
     
     
         3 . The golf club head of  claim 1 , wherein said golf club head has a MOI-X to MOI-Z ratio of greater than about 1.1. 
     
     
         4 . The golf club head of  claim 1 , wherein said golf club head has a MOI-X to MOI-Z ratio of greater than about 1.20. 
     
     
         5 . The golf club head of  claim 1 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-y, that is at less about 0.4 times a face height from a ground plane. 
     
     
         6 . The golf club head of  claim 1 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-y, that is at less about 0.35 times a crown height from a ground plane. 
     
     
         7 . The golf club head of  claim 1 , wherein said MOI-Y is less than 400 kg-mm 2 . 
     
     
         8 . The golf club head of  claim 1 , wherein said MOI-Y is less than 300 kg-mm 2 . 
     
     
         9 . A golf club head comprising:
 a frontal portion further comprising a striking face that helps define a face center, located at a forward portion of said golf club head; and   a rear portion, located aft of said striking face, and coupled to said frontal portion to defined a club head volume of between about 250 cc and about 400 cc;   wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said striking face with a positive direction towards a heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive direction towards a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards said frontal portion of said golf club head,   wherein said frontal portion and said rear portion combine to define a club head depth, which is a distance between a leading edge of said club head to a rear most portion of said golf club head, along said z-axis,   wherein said golf club head has a moment of inertia about said x-axis (MOI-X), a moment of inertia about said y-axis (MOI-Y), and a moment of inertia about said z-axis (MOI-Z),   wherein said MOI-Y of said golf club head is less than about 400 kg-mm 2 ,   wherein said golf club head has a CG-z that is at least 0.33 times greater than said club head depth.   
     
     
         10 . The golf club head of  claim 9 , wherein said golf club head has a MOI-X to MOI-Y ratio of greater than about 0.65 
     
     
         11 . The golf club head of  claim 10 , wherein said volume is less than about 300 cc. 
     
     
         12 . The golf club head of  claim 11 , wherein said MOI-Y of said golf club head is less than about 300 kg-mm 2 . 
     
     
         13 . The golf club head of  claim 9 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-y, that is at less about 0.4 times a face height from a ground plane. 
     
     
         14 . The golf club head of  claim 13 , wherein said golf club head has a center of gravity a vertical distance up from a ground plane, CG-y, that is at less about 0.35 times a crown height from a ground plane. 
     
     
         15 . A golf club head comprising:
 a frontal portion further comprising a striking face that helps define a face center, located at a forward portion of said golf club head;   a rear portion, located aft of said striking face, and coupled to said frontal portion to define a club head volume of between about 250 cc and about 400 cc; and   wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said striking face with a positive direction towards a heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive direction towards a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards said frontal portion of said golf club head, and   wherein said golf club head has a moment of inertia about said x-axis (MOI-X), a moment of inertia about said y-axis (MOI-Y), and a moment of inertia about said z-axis (MOI-Z),   wherein said golf club head has a MOI-X to MOI-Y ratio of greater than about 0.65,   wherein said golf club head has a MOI-Z measurement of less than about 268 kg-mm 2 ,   wherein said golf club head has a moment of inertia about a shaft axis (MOI-SA) measurement of less than about 800 kg-mm 2 .   
     
     
         16 . The golf club head of  claim 15 , wherein said golf club head has a MOI-Y to MOI-Z ratio of greater than about 1.68. 
     
     
         17 . The golf club head of  claim 15 , wherein said MOI-Y of said golf club head is less than about 400 kg-mm 2 . 
     
     
         18 . The golf club head of  claim 17 , wherein said MOI-Y of said golf club head is less than about 300 kg-mm 2 . 
     
     
         19 . The golf club head of  claim 15 , wherein said golf club head has a CG-z that is at least 0.33 times greater than a club head depth.